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Add: (7)/((-27))and(-11)/(18)...

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`(7)/((-27))and(-11)/(18)`

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Add: (7)/((-18))and(8)/(27)

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Add the rational numbers: (i) -3\ a n d3/5 (ii) (-7)/(27)\ a n d(11)/(18)

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Add\ 4/(-11)\ and\ 7/(11)

Add, each pair of rational numbers, given below, and show that their addition (sum) is also a rational number : (viii) (7)/(-18) "and" (8)/(27)

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Express the following angles in degrees : (pi)/(6),(14)/(15)pi,(11)/(18)pi,(7)/(90)pi